Suros Arsenal Pack is a pre-order bonus for Destiny: The Taken King. It includes three different kinds of Rifles (Assault, Pulse and Scout – none of them is impressive until you upgrade) and a Shader. It can be a bit tricky to find them anyway, so here's where you have to search.
You can find them at the Vanguard Quartermaster in the Tower. The robot can be found on the right side of the Tower from where you come in at. He is to the right at the bottom of the steps.
Destiny: The Taken King is now available for PS3, PS4, Xbox 360 and Xbox One. Destiny: The Taken King is the third expansion for the first-person shooter game Destiny, and by far the largest addition to the Destiny universe yet. The Taken King introduces a new story campaign and quests, new enemies to fight, new locations to explore, new Strikes and Crucible maps, a new Raid that will put players to the ultimate test, and more. To stand up to the challenge, players will have access to three new devastating Guardian subclasses, and a massive arsenal of weapons, armor, and gear.